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Journal Articles Nature Communications Year : 2022

Constraints on the martian crust away from the InSight landing site

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Abstract

Abstract The most distant marsquake recorded so far by the InSight seismometer occurred at an epicentral distance of 146.3 ± 6.9 o , close to the western end of Valles Marineris. On the seismogram of this event, we have identified seismic wave precursors, i.e., underside reflections off a subsurface discontinuity halfway between the marsquake and the instrument, which directly constrain the crustal structure away (about 4100−4500 km) from the InSight landing site. Here we show that the Martian crust at the bounce point between the lander and the marsquake is characterized by a discontinuity at about 20 km depth, similar to the second (deeper) intra-crustal interface seen beneath the InSight landing site. We propose that this 20-km interface, first discovered beneath the lander, is not a local geological structure but likely a regional or global feature, and is consistent with a transition from porous to non-porous Martian crustal materials.
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Origin : Publication funded by an institution

Dates and versions

hal-03918308 , version 1 (02-01-2023)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Jiaqi Li, Caroline Beghein, Scott M Mclennan, Anna C Horleston, Constantinos Charalambous, et al.. Constraints on the martian crust away from the InSight landing site. Nature Communications, 2022, 13 (1), pp.7950. ⟨10.1038/s41467-022-35662-y⟩. ⟨hal-03918308⟩
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